linux/drivers/hwmon/adm1025.c
<<
>>
Prefs
   1/*
   2 * adm1025.c
   3 *
   4 * Copyright (C) 2000       Chen-Yuan Wu <gwu@esoft.com>
   5 * Copyright (C) 2003-2009  Jean Delvare <khali@linux-fr.org>
   6 *
   7 * The ADM1025 is a sensor chip made by Analog Devices. It reports up to 6
   8 * voltages (including its own power source) and up to two temperatures
   9 * (its own plus up to one external one). Voltages are scaled internally
  10 * (which is not the common way) with ratios such that the nominal value
  11 * of each voltage correspond to a register value of 192 (which means a
  12 * resolution of about 0.5% of the nominal value). Temperature values are
  13 * reported with a 1 deg resolution and a 3 deg accuracy. Complete
  14 * datasheet can be obtained from Analog's website at:
  15 *   http://www.onsemi.com/PowerSolutions/product.do?id=ADM1025
  16 *
  17 * This driver also supports the ADM1025A, which differs from the ADM1025
  18 * only in that it has "open-drain VID inputs while the ADM1025 has
  19 * on-chip 100k pull-ups on the VID inputs". It doesn't make any
  20 * difference for us.
  21 *
  22 * This driver also supports the NE1619, a sensor chip made by Philips.
  23 * That chip is similar to the ADM1025A, with a few differences. The only
  24 * difference that matters to us is that the NE1619 has only two possible
  25 * addresses while the ADM1025A has a third one. Complete datasheet can be
  26 * obtained from Philips's website at:
  27 *   http://www.semiconductors.philips.com/pip/NE1619DS.html
  28 *
  29 * Since the ADM1025 was the first chipset supported by this driver, most
  30 * comments will refer to this chipset, but are actually general and
  31 * concern all supported chipsets, unless mentioned otherwise.
  32 *
  33 * This program is free software; you can redistribute it and/or modify
  34 * it under the terms of the GNU General Public License as published by
  35 * the Free Software Foundation; either version 2 of the License, or
  36 * (at your option) any later version.
  37 *
  38 * This program is distributed in the hope that it will be useful,
  39 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  40 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  41 * GNU General Public License for more details.
  42 *
  43 * You should have received a copy of the GNU General Public License
  44 * along with this program; if not, write to the Free Software
  45 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  46 */
  47
  48#include <linux/module.h>
  49#include <linux/init.h>
  50#include <linux/slab.h>
  51#include <linux/jiffies.h>
  52#include <linux/i2c.h>
  53#include <linux/hwmon.h>
  54#include <linux/hwmon-sysfs.h>
  55#include <linux/hwmon-vid.h>
  56#include <linux/err.h>
  57#include <linux/mutex.h>
  58
  59/*
  60 * Addresses to scan
  61 * ADM1025 and ADM1025A have three possible addresses: 0x2c, 0x2d and 0x2e.
  62 * NE1619 has two possible addresses: 0x2c and 0x2d.
  63 */
  64
  65static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  66
  67enum chips { adm1025, ne1619 };
  68
  69/*
  70 * The ADM1025 registers
  71 */
  72
  73#define ADM1025_REG_MAN_ID              0x3E
  74#define ADM1025_REG_CHIP_ID             0x3F
  75#define ADM1025_REG_CONFIG              0x40
  76#define ADM1025_REG_STATUS1             0x41
  77#define ADM1025_REG_STATUS2             0x42
  78#define ADM1025_REG_IN(nr)              (0x20 + (nr))
  79#define ADM1025_REG_IN_MAX(nr)          (0x2B + (nr) * 2)
  80#define ADM1025_REG_IN_MIN(nr)          (0x2C + (nr) * 2)
  81#define ADM1025_REG_TEMP(nr)            (0x26 + (nr))
  82#define ADM1025_REG_TEMP_HIGH(nr)       (0x37 + (nr) * 2)
  83#define ADM1025_REG_TEMP_LOW(nr)        (0x38 + (nr) * 2)
  84#define ADM1025_REG_VID                 0x47
  85#define ADM1025_REG_VID4                0x49
  86
  87/*
  88 * Conversions and various macros
  89 * The ADM1025 uses signed 8-bit values for temperatures.
  90 */
  91
  92static const int in_scale[6] = { 2500, 2250, 3300, 5000, 12000, 3300 };
  93
  94#define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
  95#define IN_TO_REG(val, scale)   ((val) <= 0 ? 0 : \
  96                                 (val) * 192 >= (scale) * 255 ? 255 : \
  97                                 ((val) * 192 + (scale) / 2) / (scale))
  98
  99#define TEMP_FROM_REG(reg)      ((reg) * 1000)
 100#define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
 101                                 (val) >= 126500 ? 127 : \
 102                                 (((val) < 0 ? (val) - 500 : \
 103                                   (val) + 500) / 1000))
 104
 105/*
 106 * Functions declaration
 107 */
 108
 109static int adm1025_probe(struct i2c_client *client,
 110                         const struct i2c_device_id *id);
 111static int adm1025_detect(struct i2c_client *client,
 112                          struct i2c_board_info *info);
 113static void adm1025_init_client(struct i2c_client *client);
 114static int adm1025_remove(struct i2c_client *client);
 115static struct adm1025_data *adm1025_update_device(struct device *dev);
 116
 117/*
 118 * Driver data (common to all clients)
 119 */
 120
 121static const struct i2c_device_id adm1025_id[] = {
 122        { "adm1025", adm1025 },
 123        { "ne1619", ne1619 },
 124        { }
 125};
 126MODULE_DEVICE_TABLE(i2c, adm1025_id);
 127
 128static struct i2c_driver adm1025_driver = {
 129        .class          = I2C_CLASS_HWMON,
 130        .driver = {
 131                .name   = "adm1025",
 132        },
 133        .probe          = adm1025_probe,
 134        .remove         = adm1025_remove,
 135        .id_table       = adm1025_id,
 136        .detect         = adm1025_detect,
 137        .address_list   = normal_i2c,
 138};
 139
 140/*
 141 * Client data (each client gets its own)
 142 */
 143
 144struct adm1025_data {
 145        struct device *hwmon_dev;
 146        struct mutex update_lock;
 147        char valid; /* zero until following fields are valid */
 148        unsigned long last_updated; /* in jiffies */
 149
 150        u8 in[6];               /* register value */
 151        u8 in_max[6];           /* register value */
 152        u8 in_min[6];           /* register value */
 153        s8 temp[2];             /* register value */
 154        s8 temp_min[2];         /* register value */
 155        s8 temp_max[2];         /* register value */
 156        u16 alarms;             /* register values, combined */
 157        u8 vid;                 /* register values, combined */
 158        u8 vrm;
 159};
 160
 161/*
 162 * Sysfs stuff
 163 */
 164
 165static ssize_t
 166show_in(struct device *dev, struct device_attribute *attr, char *buf)
 167{
 168        int index = to_sensor_dev_attr(attr)->index;
 169        struct adm1025_data *data = adm1025_update_device(dev);
 170        return sprintf(buf, "%u\n", IN_FROM_REG(data->in[index],
 171                       in_scale[index]));
 172}
 173
 174static ssize_t
 175show_in_min(struct device *dev, struct device_attribute *attr, char *buf)
 176{
 177        int index = to_sensor_dev_attr(attr)->index;
 178        struct adm1025_data *data = adm1025_update_device(dev);
 179        return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[index],
 180                       in_scale[index]));
 181}
 182
 183static ssize_t
 184show_in_max(struct device *dev, struct device_attribute *attr, char *buf)
 185{
 186        int index = to_sensor_dev_attr(attr)->index;
 187        struct adm1025_data *data = adm1025_update_device(dev);
 188        return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[index],
 189                       in_scale[index]));
 190}
 191
 192static ssize_t
 193show_temp(struct device *dev, struct device_attribute *attr, char *buf)
 194{
 195        int index = to_sensor_dev_attr(attr)->index;
 196        struct adm1025_data *data = adm1025_update_device(dev);
 197        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[index]));
 198}
 199
 200static ssize_t
 201show_temp_min(struct device *dev, struct device_attribute *attr, char *buf)
 202{
 203        int index = to_sensor_dev_attr(attr)->index;
 204        struct adm1025_data *data = adm1025_update_device(dev);
 205        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[index]));
 206}
 207
 208static ssize_t
 209show_temp_max(struct device *dev, struct device_attribute *attr, char *buf)
 210{
 211        int index = to_sensor_dev_attr(attr)->index;
 212        struct adm1025_data *data = adm1025_update_device(dev);
 213        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
 214}
 215
 216static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 217                          const char *buf, size_t count)
 218{
 219        int index = to_sensor_dev_attr(attr)->index;
 220        struct i2c_client *client = to_i2c_client(dev);
 221        struct adm1025_data *data = i2c_get_clientdata(client);
 222        long val;
 223        int err;
 224
 225        err = kstrtol(buf, 10, &val);
 226        if (err)
 227                return err;
 228
 229        mutex_lock(&data->update_lock);
 230        data->in_min[index] = IN_TO_REG(val, in_scale[index]);
 231        i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(index),
 232                                  data->in_min[index]);
 233        mutex_unlock(&data->update_lock);
 234        return count;
 235}
 236
 237static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 238                          const char *buf, size_t count)
 239{
 240        int index = to_sensor_dev_attr(attr)->index;
 241        struct i2c_client *client = to_i2c_client(dev);
 242        struct adm1025_data *data = i2c_get_clientdata(client);
 243        long val;
 244        int err;
 245
 246        err = kstrtol(buf, 10, &val);
 247        if (err)
 248                return err;
 249
 250        mutex_lock(&data->update_lock);
 251        data->in_max[index] = IN_TO_REG(val, in_scale[index]);
 252        i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(index),
 253                                  data->in_max[index]);
 254        mutex_unlock(&data->update_lock);
 255        return count;
 256}
 257
 258#define set_in(offset) \
 259static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 260        show_in, NULL, offset); \
 261static SENSOR_DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \
 262        show_in_min, set_in_min, offset); \
 263static SENSOR_DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \
 264        show_in_max, set_in_max, offset)
 265set_in(0);
 266set_in(1);
 267set_in(2);
 268set_in(3);
 269set_in(4);
 270set_in(5);
 271
 272static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 273                            const char *buf, size_t count)
 274{
 275        int index = to_sensor_dev_attr(attr)->index;
 276        struct i2c_client *client = to_i2c_client(dev);
 277        struct adm1025_data *data = i2c_get_clientdata(client);
 278        long val;
 279        int err;
 280
 281        err = kstrtol(buf, 10, &val);
 282        if (err)
 283                return err;
 284
 285        mutex_lock(&data->update_lock);
 286        data->temp_min[index] = TEMP_TO_REG(val);
 287        i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(index),
 288                                  data->temp_min[index]);
 289        mutex_unlock(&data->update_lock);
 290        return count;
 291}
 292
 293static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 294        const char *buf, size_t count)
 295{
 296        int index = to_sensor_dev_attr(attr)->index;
 297        struct i2c_client *client = to_i2c_client(dev);
 298        struct adm1025_data *data = i2c_get_clientdata(client);
 299        long val;
 300        int err;
 301
 302        err = kstrtol(buf, 10, &val);
 303        if (err)
 304                return err;
 305
 306        mutex_lock(&data->update_lock);
 307        data->temp_max[index] = TEMP_TO_REG(val);
 308        i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(index),
 309                                  data->temp_max[index]);
 310        mutex_unlock(&data->update_lock);
 311        return count;
 312}
 313
 314#define set_temp(offset) \
 315static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
 316        show_temp, NULL, offset - 1); \
 317static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \
 318        show_temp_min, set_temp_min, offset - 1); \
 319static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \
 320        show_temp_max, set_temp_max, offset - 1)
 321set_temp(1);
 322set_temp(2);
 323
 324static ssize_t
 325show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 326{
 327        struct adm1025_data *data = adm1025_update_device(dev);
 328        return sprintf(buf, "%u\n", data->alarms);
 329}
 330static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 331
 332static ssize_t
 333show_alarm(struct device *dev, struct device_attribute *attr, char *buf)
 334{
 335        int bitnr = to_sensor_dev_attr(attr)->index;
 336        struct adm1025_data *data = adm1025_update_device(dev);
 337        return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 338}
 339static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 340static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 341static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 342static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 343static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 344static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 345static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 5);
 346static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 4);
 347static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_alarm, NULL, 14);
 348
 349static ssize_t
 350show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 351{
 352        struct adm1025_data *data = adm1025_update_device(dev);
 353        return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
 354}
 355static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 356
 357static ssize_t
 358show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
 359{
 360        struct adm1025_data *data = dev_get_drvdata(dev);
 361        return sprintf(buf, "%u\n", data->vrm);
 362}
 363static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
 364                       const char *buf, size_t count)
 365{
 366        struct adm1025_data *data = dev_get_drvdata(dev);
 367        unsigned long val;
 368        int err;
 369
 370        err = kstrtoul(buf, 10, &val);
 371        if (err)
 372                return err;
 373
 374        data->vrm = val;
 375        return count;
 376}
 377static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 378
 379/*
 380 * Real code
 381 */
 382
 383static struct attribute *adm1025_attributes[] = {
 384        &sensor_dev_attr_in0_input.dev_attr.attr,
 385        &sensor_dev_attr_in1_input.dev_attr.attr,
 386        &sensor_dev_attr_in2_input.dev_attr.attr,
 387        &sensor_dev_attr_in3_input.dev_attr.attr,
 388        &sensor_dev_attr_in5_input.dev_attr.attr,
 389        &sensor_dev_attr_in0_min.dev_attr.attr,
 390        &sensor_dev_attr_in1_min.dev_attr.attr,
 391        &sensor_dev_attr_in2_min.dev_attr.attr,
 392        &sensor_dev_attr_in3_min.dev_attr.attr,
 393        &sensor_dev_attr_in5_min.dev_attr.attr,
 394        &sensor_dev_attr_in0_max.dev_attr.attr,
 395        &sensor_dev_attr_in1_max.dev_attr.attr,
 396        &sensor_dev_attr_in2_max.dev_attr.attr,
 397        &sensor_dev_attr_in3_max.dev_attr.attr,
 398        &sensor_dev_attr_in5_max.dev_attr.attr,
 399        &sensor_dev_attr_in0_alarm.dev_attr.attr,
 400        &sensor_dev_attr_in1_alarm.dev_attr.attr,
 401        &sensor_dev_attr_in2_alarm.dev_attr.attr,
 402        &sensor_dev_attr_in3_alarm.dev_attr.attr,
 403        &sensor_dev_attr_in5_alarm.dev_attr.attr,
 404        &sensor_dev_attr_temp1_input.dev_attr.attr,
 405        &sensor_dev_attr_temp2_input.dev_attr.attr,
 406        &sensor_dev_attr_temp1_min.dev_attr.attr,
 407        &sensor_dev_attr_temp2_min.dev_attr.attr,
 408        &sensor_dev_attr_temp1_max.dev_attr.attr,
 409        &sensor_dev_attr_temp2_max.dev_attr.attr,
 410        &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 411        &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 412        &sensor_dev_attr_temp1_fault.dev_attr.attr,
 413        &dev_attr_alarms.attr,
 414        &dev_attr_cpu0_vid.attr,
 415        &dev_attr_vrm.attr,
 416        NULL
 417};
 418
 419static const struct attribute_group adm1025_group = {
 420        .attrs = adm1025_attributes,
 421};
 422
 423static struct attribute *adm1025_attributes_in4[] = {
 424        &sensor_dev_attr_in4_input.dev_attr.attr,
 425        &sensor_dev_attr_in4_min.dev_attr.attr,
 426        &sensor_dev_attr_in4_max.dev_attr.attr,
 427        &sensor_dev_attr_in4_alarm.dev_attr.attr,
 428        NULL
 429};
 430
 431static const struct attribute_group adm1025_group_in4 = {
 432        .attrs = adm1025_attributes_in4,
 433};
 434
 435/* Return 0 if detection is successful, -ENODEV otherwise */
 436static int adm1025_detect(struct i2c_client *client,
 437                          struct i2c_board_info *info)
 438{
 439        struct i2c_adapter *adapter = client->adapter;
 440        const char *name;
 441        u8 man_id, chip_id;
 442
 443        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 444                return -ENODEV;
 445
 446        /* Check for unused bits */
 447        if ((i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG) & 0x80)
 448         || (i2c_smbus_read_byte_data(client, ADM1025_REG_STATUS1) & 0xC0)
 449         || (i2c_smbus_read_byte_data(client, ADM1025_REG_STATUS2) & 0xBC)) {
 450                dev_dbg(&adapter->dev, "ADM1025 detection failed at 0x%02x\n",
 451                        client->addr);
 452                return -ENODEV;
 453        }
 454
 455        /* Identification */
 456        chip_id = i2c_smbus_read_byte_data(client, ADM1025_REG_CHIP_ID);
 457        if ((chip_id & 0xF0) != 0x20)
 458                return -ENODEV;
 459
 460        man_id = i2c_smbus_read_byte_data(client, ADM1025_REG_MAN_ID);
 461        if (man_id == 0x41)
 462                name = "adm1025";
 463        else if (man_id == 0xA1 && client->addr != 0x2E)
 464                name = "ne1619";
 465        else
 466                return -ENODEV;
 467
 468        strlcpy(info->type, name, I2C_NAME_SIZE);
 469
 470        return 0;
 471}
 472
 473static int adm1025_probe(struct i2c_client *client,
 474                         const struct i2c_device_id *id)
 475{
 476        struct adm1025_data *data;
 477        int err;
 478        u8 config;
 479
 480        data = devm_kzalloc(&client->dev, sizeof(struct adm1025_data),
 481                            GFP_KERNEL);
 482        if (!data)
 483                return -ENOMEM;
 484
 485        i2c_set_clientdata(client, data);
 486        mutex_init(&data->update_lock);
 487
 488        /* Initialize the ADM1025 chip */
 489        adm1025_init_client(client);
 490
 491        /* Register sysfs hooks */
 492        err = sysfs_create_group(&client->dev.kobj, &adm1025_group);
 493        if (err)
 494                return err;
 495
 496        /* Pin 11 is either in4 (+12V) or VID4 */
 497        config = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
 498        if (!(config & 0x20)) {
 499                err = sysfs_create_group(&client->dev.kobj, &adm1025_group_in4);
 500                if (err)
 501                        goto exit_remove;
 502        }
 503
 504        data->hwmon_dev = hwmon_device_register(&client->dev);
 505        if (IS_ERR(data->hwmon_dev)) {
 506                err = PTR_ERR(data->hwmon_dev);
 507                goto exit_remove;
 508        }
 509
 510        return 0;
 511
 512exit_remove:
 513        sysfs_remove_group(&client->dev.kobj, &adm1025_group);
 514        sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
 515        return err;
 516}
 517
 518static void adm1025_init_client(struct i2c_client *client)
 519{
 520        u8 reg;
 521        struct adm1025_data *data = i2c_get_clientdata(client);
 522        int i;
 523
 524        data->vrm = vid_which_vrm();
 525
 526        /*
 527         * Set high limits
 528         * Usually we avoid setting limits on driver init, but it happens
 529         * that the ADM1025 comes with stupid default limits (all registers
 530         * set to 0). In case the chip has not gone through any limit
 531         * setting yet, we better set the high limits to the max so that
 532         * no alarm triggers.
 533         */
 534        for (i = 0; i < 6; i++) {
 535                reg = i2c_smbus_read_byte_data(client,
 536                                               ADM1025_REG_IN_MAX(i));
 537                if (reg == 0)
 538                        i2c_smbus_write_byte_data(client,
 539                                                  ADM1025_REG_IN_MAX(i),
 540                                                  0xFF);
 541        }
 542        for (i = 0; i < 2; i++) {
 543                reg = i2c_smbus_read_byte_data(client,
 544                                               ADM1025_REG_TEMP_HIGH(i));
 545                if (reg == 0)
 546                        i2c_smbus_write_byte_data(client,
 547                                                  ADM1025_REG_TEMP_HIGH(i),
 548                                                  0x7F);
 549        }
 550
 551        /*
 552         * Start the conversions
 553         */
 554        reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
 555        if (!(reg & 0x01))
 556                i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG,
 557                                          (reg&0x7E)|0x01);
 558}
 559
 560static int adm1025_remove(struct i2c_client *client)
 561{
 562        struct adm1025_data *data = i2c_get_clientdata(client);
 563
 564        hwmon_device_unregister(data->hwmon_dev);
 565        sysfs_remove_group(&client->dev.kobj, &adm1025_group);
 566        sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
 567
 568        return 0;
 569}
 570
 571static struct adm1025_data *adm1025_update_device(struct device *dev)
 572{
 573        struct i2c_client *client = to_i2c_client(dev);
 574        struct adm1025_data *data = i2c_get_clientdata(client);
 575
 576        mutex_lock(&data->update_lock);
 577
 578        if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
 579                int i;
 580
 581                dev_dbg(&client->dev, "Updating data.\n");
 582                for (i = 0; i < 6; i++) {
 583                        data->in[i] = i2c_smbus_read_byte_data(client,
 584                                      ADM1025_REG_IN(i));
 585                        data->in_min[i] = i2c_smbus_read_byte_data(client,
 586                                          ADM1025_REG_IN_MIN(i));
 587                        data->in_max[i] = i2c_smbus_read_byte_data(client,
 588                                          ADM1025_REG_IN_MAX(i));
 589                }
 590                for (i = 0; i < 2; i++) {
 591                        data->temp[i] = i2c_smbus_read_byte_data(client,
 592                                        ADM1025_REG_TEMP(i));
 593                        data->temp_min[i] = i2c_smbus_read_byte_data(client,
 594                                            ADM1025_REG_TEMP_LOW(i));
 595                        data->temp_max[i] = i2c_smbus_read_byte_data(client,
 596                                            ADM1025_REG_TEMP_HIGH(i));
 597                }
 598                data->alarms = i2c_smbus_read_byte_data(client,
 599                               ADM1025_REG_STATUS1)
 600                             | (i2c_smbus_read_byte_data(client,
 601                                ADM1025_REG_STATUS2) << 8);
 602                data->vid = (i2c_smbus_read_byte_data(client,
 603                             ADM1025_REG_VID) & 0x0f)
 604                          | ((i2c_smbus_read_byte_data(client,
 605                              ADM1025_REG_VID4) & 0x01) << 4);
 606
 607                data->last_updated = jiffies;
 608                data->valid = 1;
 609        }
 610
 611        mutex_unlock(&data->update_lock);
 612
 613        return data;
 614}
 615
 616module_i2c_driver(adm1025_driver);
 617
 618MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
 619MODULE_DESCRIPTION("ADM1025 driver");
 620MODULE_LICENSE("GPL");
 621
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.